Experimental investigation on porosity of carbon fiber-reinforced composite using ultrasonic attenuation coefficient

摘要：

The present work experimentally investigates the correlations between ultrasonic attenuation coefficient and void content with the porosity 0.03%-4.96% of the carbon fiber-reinforced composite (CFRC) samples. The ultrasonic echo immersion bottom reflection technique with 5MHz flat probe is adopted to determine the attenuation coefficient and the metallographic microscope is used to measure the porosity destructively. A linear and a parabolic curve are found to be suitable to fit the data with the porosity 0.03%-0.5% and 0.5%-4.96%, respectively. It is observed that ultrasonic predictions accord with the microscopic results. The present data have been compared with the known testing models and empirical formulas. The power law between the attenuation coefficient and the porosity, the critical porosity phenomenon, and the effects of void morphology on ultrasonic attenuation have been discussed. This work not only provides experimental evidence in making clear the ultrasonic attenuation mechanism of pores, but also further proves that the attenuation coefficient could be used to nondestructively characterize the void content in composites.

关键词： carbon fiber-reinforced composite porosity ultrasonic testing attenuationcoefficient

作者: L. LIN M. LUO H. T. TIAN X. M. LI G. P. GUO

作者单位: NDT & E Laboratory, School of Materials Science & Engineering,Dalian University of Technology, Dalia Beijing Aerospace Research Institute of Materials and Processing Technology,Beijing, 100076, China Beijing Institute of Aeronautic Materials, Beijing, 100095, China

会议类型: 国际会议

会议名称: 第十七届世界无损检测会议(17th World Conference on Nondestructive Testing)

会议地点: 上海

会议语种:英文

页码: 1215-1223

在线出版日期: 2008-10-25（万方平台首次上网日期，不代表论文的发表时间）